【小站出品】雅思阅读机经真题解析-考拉之恋

A

Koalas are just too nice for their own good. And except for the occasional baby taken by birds of prey (n.捕食)，koalas have no natural enemies. In an ideal world, the life of an arboreal couch potato would be perfectly safe and acceptable.

B

Just two hundred years ago, koalas flourished(v.茂盛、繁荣) across Australia. Now they seem to be in decline, but exact numbers are not available as the species would not seem to be 'under threat'. Their problem, however, has been nan, more specifically, the white man. Koala and aborigine had co-existed peacefully for centuries.

C

Today koalas are found only in scattered pockets of southeast Australia where they seem to be at the risk on several fronts. The koala‘s only food source, the eucalyptus tree (n.桉树)，has declined. In the past 200 years, a third of Australia's eucalyptus forests have disappeared. Koalas have been killed by parasites, chlamydia epidemics(衣原体感染)     and a tumour-causing retro-virus. And every year 11000 are killed by cars, ironically most of them in wildlife sanctuaries, and thousands are killed by poachers. Some are also taken illegally as pets. The animals usually soon die, but they are easily replaced.

D

Bush fires pose another threat. The horrific ones that raged in New South Wales recently Killed between 100 and 1000 Koalas. Many that were taken into sanctuaries and shelters were found to have burnt their paws on the glowing embers(灰烬).But zoologists say that the species should recover. The Koalas will be aided by the eucalyptus, which grows quickly and is already burgeoning forth after the fires. So the main problem to their survival is their slow reproductive rate - they produce only one baby a year over a reproductive lifespan of about nine years.

E

The latest problem for the species is perhaps more insidious. With plush, grey fur(n.毛皮)，dark amber eyes and button nose, koalas are cuddliness incarnate Australian zoos and wildlife parks have taken advantage of their uncomplaining attitudes, and charge visitors to be photographed hugging the furry bundles. But people may not realise how cruel this is, but because of the koala's delicate disposition, constant handling can push an already precariously balanced physiology (n.生理)over the edge.

F

Koalas only eat the foliage of certain species of eucalyptus trees, between 600 and 1250 grams a day. The tough leaves are packed with cellulose (n.纤维素), tannins, aromatic oils and precursors of toxic cyanides. To handle this cocktail, koalas have a specialised digestive system. Cellulose-digesting bacteria in the caecum (盲肠) break down fibre, while a specially adapted gut and liver process the toxins. To digest their food properly, koalas must sit still for 21 hours every day.

G

Koalas are the epitome of innocence and inoffensiveness. Although they are capable of ripping open a man’s arm with their needle-sharp claws, or giving a nasty nip, they simply wouldn't. If you upset a koala, it may blink or swallow, or hiccup(打嗝). But attack? No way! Koalas are just not aggressive. "They use their claws to grip the hard smooth bark of eucalyptus trees.

H

They are also very sensitive (v.敏感的)，and the slightest upset can prevent them from breeding, cause them to go off their food, and succumb to gut infections. Koalas are stoic creatures and put on a brave face until they are at death's door. One day they may appear healthy, the next they could be dead. Captive koalas have to be weighed daily to check that they are feeding properly. A sudden loss of weight is usually the only warning keepers have that their charge is ill. Only two keepers plus a vet were allowed to handle London Zoo's koalas, as these creatures are only comfortable with people they know. A request for the koala to be taken to Beet the Queen was refused because of the distress this would have caused the marsupial. Sadly. London's Zoo no longer has a koala. Two years ago the female koala died of a cancer caused by a retrovirus. When they come into heat, female koalas become more active, and start losing weight, but after about sixteen days, heat ends and the weight piles back on. London' s koala did not. Surgery revealed hundreds of pea-sized tumours.

I

Almost every zoo in Australia has koalas-the marsupial(n.有袋动物) has become the Animal Ambassador of the nation, but nowhere outside Australia would handling by the public be allowed. Koala cuddling screams in the face of every rule of good care. First, some zoos allow koalas to be passed from stranger to stranger, many children who love to squeeze. Secondly, most people have no idea of how to handle the animals: they like to cling on to their handler, all in their own good time and use his or her arm as a tree. For such reasons, the Association of Fauna and Marine parks, an Australian conservation society is campaigning to ban koala cuddling. Policy on koala handling is determined by state government authorities. "And the largest of the numbers in the Australian nature Conservation Agency, with the aim of instituting national guidelines. Following a wave of publicity, some zoos and wildlife parks have stopped turning their koalas into photo.

体裁

论说文

题目

考拉

结构

A段：考拉的生存环境舒适

B段：最近考拉数量减少

C段：目前考拉数量减少是由这几种原因组成：食物，疾病，车祸，偷猎者和宠物收养。

D段：火灾和低繁殖率也是影响考拉数量的因素。

E段：对考拉身体造成威胁的一种情况： 动物园允许游客和考拉拥抱和照相。

F段：考拉特定的消化系统能够消化桉树的树叶。

G段：考拉天性随和，被打扰时它的反应奇怪，但没有攻击性。

H段：考拉的敏感会导致它停止繁殖或者病倒。

澳大利亚制定政策禁止游客和考拉拍照。